In the Sonic Classics version of REV02, it's not possible to spindash off the Tornado. This is because the game is jumping to code it's never meant to, resulting in invalid opcodes and an eventual crash. If the player breaks a rock and then destroys a Rexon in a certain way, the game will crash. Tails sometimes uses his standing animation when moving. This was fixed in Knuckles in Sonic 2 and 3D Sonic the Hedgehog 2, but not in the vanilla version of the game. The bottom two pixels don't scroll correctly. In REV00, the crash happens for a completely different reason this build has sanity checks to prevent such a circumstance occurring (by checking both the object's ID and mappings), however the code it jumps to forces the game to read address 0x000001 from a word address, causing another crash this code didn't exist in earlier builds, and was likely implemented to detect Sonic 1‍ 's 'clusterfuck' bug, where objects were displaying before being initialized (potentially leading to the object being deleted on the same frame as displaying, which itself could cause crashes with Sonic 2‍ 's new mappings format).

Thanks to Tail's return, complete with rocket boosters attached to his repaired plane, Sonic can give chase and grab on to the shuttle before it enters space and docks at Robotniks ultimate weapon - the Death Egg.Normally, the game prevents any object that hasn't had their variables fully initiated from crashing the game by checking if the 'rendering bits' have been set however, when placing an object in Debug Mode while 'dead', the game only clears the lower bit of object variable $01, meaning the upper bit is never cleared, meaning the object never fully initializes, causing a crash.

Once Robotnik is defeated he flees to his shuttle and escapes into the atmosphere. Two spiky platforms float around and a third deadly laser appears from the ceiling which Sonic must take out using the moving platforms to his advantage. Once Sonic finds his way inside the ship Robotnik traps him between two laser columns. Fans of the 8-bit original Sonic may find similarities between this Zone and the blimp fortress in Sky Base Zone. Robotic chickens in egg-firing turrets are the only badniks of concern but the fortress itself is filled with deadly propeller blades, strong wind currents and of course the fact that Sonic could fall off the ship completely if he puts a foot wrong. As Tails was in the plane as it went down, you are on your own for the rest of the game. At the very start of this zone the plane is shot down and you must quickly jump onto the platform of Dr.

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